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The reaction of [1,2,4]triazolo[4,3-a]pyridinium tetrafluoroborates with [RhCl(COD)](2) and [PdCl(allyl)](2) takes place under mild basic conditions (Et(3)N, THF, room temperature) to afford the corresponding [RhCl(COD)(Tripy)] and [PdCl(allyl)(Tripy)] complexes, respectively (Tripy = [1,2,4]triazolo[4,3-a]pyridin-3-ylidene), and their structures were analysed by X-ray diffractometry and spectroscopic techniques. The sigma-donor ability of the new ligands was estimated by comparative analysis of infrared nu(CO) stretching frequencies of [RhCl(CO)(2)(Tripy)] complexes, and proved to be strongly dependent on the substitution pattern. Additionally, a first insight into the catalytic properties of the latter in the Suzuki-Miyaura cross coupling demonstrates a good catalytic activity that enables the coupling of aryl chlorides at room temperature.

Synthesis, structure and properties of [1,2,4]triazolo[4,3-a]pyridin-3-ylidene rhodium and palladium complexes